Interesting that Canon has gone substantially backwards in this test.
What doesn't seem to compute to me is the correlation between bare bulb and UV glass. Epson on Baryta PHotographique rates 64 years, HP rates 56 years, yet under UV glass the Epson rates >230 years, but the HP comes in at 392 years. not greater than, but a specific number like that? and that much greater even though the Epson is slightly better without glass?
Seems illogical.
Also curious why they didn't test the Baryta Prestige on the HP, but did so on the others. (also noticed Canson doesn't provide profiles for the Prestige).
Wayne,
The pages 3, 4, and 5 are copies of the tests ending in 2012, some papers were removed from that old test report and the 11 remaining ones in the copies got the new Canson names applied (Arches references stripped). Slight changes in some numbers too; 300>250 for dark storage. Baryta Prestige didn't exist pre 2012. So while it is not mentioned in the 2018 report the pages 3, 4 and 5 are old material and I have my doubts that the papers did not change since. I see that some of the result numbers date even back to a 2009 WIR pdf.
As I explained already the bare bulb tests could be limited by the paper white shift when the better inks actually withstand the exposure, like the Vivera and the HDX. That a bare bulb test result of a paper in 2018 gets ahead of a 2012 test probably says more about the paper manufacturing through time than the inks used. Check the Platine numbers, difference is even more revealing. That paper does not have OBA content but in the bare bulb test does worse than the Baryta Photographique. Improved from 2012 to 2018 too though. The 2012 test PDF mentions the start of tests on improved versions of both papers for the 3 older ink sets (my screengrabs in another message). However in the 2018 PDF the 2012 test numbers of the old version papers are copied for the 3 older ink sets, not of the two improved papers, they were never published I guess. I suppose the improved paper versions were used for the 2 new ink sets though.
Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmMarch 2017 update, 750+ inkjet media white spectral plots